The exotic \(X(3872)\)  state, first observed by the Belle experiment in 2003 [1]}, is now one of the most well-studied charmoniumlike exotic states.
Aside from pure charmonium, it may also be a \(D^0 \bar{D}^{*0}\)  molecule [2]}, a tetraquark state [3]}, or a mixture of a molecule and a charmonium [4]}.
Since \(X(3872)\)  may, unlike the \(J/\psi \) , contain components other than pure charmonium, the branching fraction of \(B^0 \rightarrow X(3872) \gamma \)  should be smaller than that of \(B^0 \rightarrow J/\psi \gamma \)  which proceeds through the \(b\rightarrow c \bar{c}\)  \(d\)  process. No former search for this decay has been published yet.
